Concerning the Development of Morality

Concerning the development of morality,

A) both Kohlberg and Piaget overestimated children's levels of moral thinking.
B) Kohlberg overestimated children's levels of moral thinking, and Piaget underestimated children's levels of moral thinking.
C) Kohlberg underestimated children's levels of moral thinking, and Piaget overestimated children's levels of moral thinking.
D) both Kohlberg and Piaget underestimated children's levels of moral thinking.